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abstract When something is abstract, it doesn't have any physical form. Feelings and ideas are abstract things. They are things, but you can't see them or touch them or even smell them! They exist in people's minds only. [1/3 definitions]
air Air is one of the things we need to live. Air is what we breathe. It is a mixture of gases. Although we breathe air, we cannot smell it, taste it, or see it. Sometimes we smell something that is in the air, but air itself does not have any smell. [2/4 definitions]
ammonia the gas with a strong smell that is formed by combining nitrogen and hydrogen. Ammonia is used to make refrigerators cold and in making fertilizers. [1/2 definitions]
antenna one of a pair of long, thin body parts on the head of insects, crabs, and other animals. Antennae are used to feel and smell. [1/2 definitions]
aroma a pleasant smell; fragrance.
bloodhound a breed of dog. Bloodhounds are large dogs with baggy skin and long, drooping ears. They have an excellent sense of smell and are used to track people or animals.
camphor a white substance with a very strong smell that is taken from the camphor tree. A form of camphor can also be made by people. Camphor is used in making some kinds of medicine and plastic.
carbon dioxide Carbon dioxide is a gas that is made up of the chemical elements oxygen and carbon. This gas has no color or smell. Carbon dioxide is produced in many different ways. People put a little carbon dioxide into the air every time they breathe out. Carbon dioxide is also made by the burning of fuels, and it is created when plants die and decay. Carbon dioxide is often written CO2 and pronounced "see oh two."
carbon monoxide a poisonous gas with no color or smell. Carbon monoxide forms when a material containing carbon, like gasoline, is not fully burned because of too little air.
carnation a flower with a pleasant smell and fringed petals. Carnations grow in many colors, including red, white, or pink.
cedar an evergreen tree of the pine family that bears cones. Cedars have strong wood with a sweet smell. [1/2 definitions]
clean When something is clean, it is not dirty. If your clothes are clean, they smell nice, and there is no dirt or food or other things on them. [1/3 definitions]
decay When a living thing decays, it breaks down through a slow, natural process. Plants begin to decay when they die. Often, when things decay, there is a bad smell. [1/4 definitions]
delicious having a pleasing taste or smell.
dirty When something is dirty, it is not clean. Dirty things often smell bad and look bad, and sometimes they can make you sick because they contain germs. [1/4 definitions]
ether a liquid that makes a person unable to think, feel, or move. Ether burns easily, has a strong smell, and was once used in medicine to make people unconscious during surgery.
faint When something is faint, it is weak, or there is only a small amount of it. When the music you hear is faint, it means that it is hard to hear or you can only hear it a little. When there is a faint smell, there is only a little bit of a smell. The smell is not strong. [1/3 definitions]
fishy like a fish in taste or smell. [1/3 definitions]
flower the part of a plant that has petals and that makes fruit or seeds; blossom. Flowers often have a pleasant smell. [1/3 definitions]
foul very unpleasant to taste, smell, or look at. [1/11 definitions]
fragrance a pleasant smell.